Long Live Spock: 10 essential Star Trek: The Original Series episodes

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Feb 27, 2015, 6:56 PM EST

As I write this it's still hard to believe that Leonard Nimoy is gone. Even to those of us who didn't know him, he felt like a friend, a mentor and a hero; the loss is truly heartbreaking. Both Spock and Nimoy were paragons of decency, nobility, virtue and humanity. In the decades since the original Star Trek first aired, Nimoy struggled and eventually made peace with the fact that he would always be identified with Spock -- and then embraced it, becoming a sort of hybrid of the fictional character and the actor who portrayed him.

For a person who suppressed his emotions, Spock was in many ways the heart of Star Trek, and it's no surprise that many of the original show's very best episodes either focused specifically on the character or featured him in a significant way. No doubt many of us will be watching Star Trek II: The Wrath of Khan or Star Trek IV: The Voyage Home in the days ahead, but if you turn to the original 79 segments in which this icon of pop culture first made his mark, here are 10 that we feel are among his finest moments. 

What were your favorite Spock moments from the original series? Let us know in the comments!